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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 50, Issue 6
Displaying 1-50 of 58 articles from this issue
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Kazuhiko Yamashita1981 Volume 50 Issue 6 Pages 1805-1806
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA model for layered superconductors is proposed and the possibility of the first order transition caused by the transformation of flux structure in the presence of the magnetic field parallel to the layers is pointed out by means of the boson theory. Flux structure is calculated for a simple case.View full abstractDownload PDF (244K) -
Yoshihiro Ohmura1981 Volume 50 Issue 6 Pages 1807-1808
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGeneralized power law (GPL) found by Mizuno, Ishikawa and Ohmura is applied to have spectral densities of inelastic electron scattering. By adopting a small range parameter obtained previously, GPL is shown to explain experimental results of inelastic electron scattering at threshold of Ritsko, Schnatterly and Gibbons on Li and Slusky, Gibbons, Schnatterly and Fields on Mg which have not been explained by the use of the Nozières and De Dominicis’ theory.View full abstractDownload PDF (280K) -
Izumi Tomeno, Hitoshi Hirano1981 Volume 50 Issue 6 Pages 1809-1810
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe elastic constants C11 of both single domain and multidomain LiTaO3 crystals were measured between 20 and 700°C by the ultrasonic phase comparison method. In the ferroelectric phase C11E had an anomalous weak temperature dependence, while in the paraelectric phase C11E decreased linearly with increasing temperature. The elastic constant C11 of the multidomain crystal was larger than C11E of the single domain crystal below TC.View full abstractDownload PDF (224K) -
Mitsuo Wada, Akikatzu Sawada, Yoshihiro Ishibashi1981 Volume 50 Issue 6 Pages 1811-1812
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt has been found that Li2Ge7O15 crystal shows ferroelectric activity in the c direction below Tc=283.5 K. The spontaneous polarization is about 0.02 μC/cm2 at 276 K. By means of Raman scattering technique a totally symmetric soft mode, whose frequency becomes zero as the phase transition point is approached from below, has been found in the αcc spectra.View full abstractDownload PDF (184K) -
Mitsuo Wada, Masaharu Suzuki, Akikatsu Sawada, Yoshihiro Ishibashi, Ka ...1981 Volume 50 Issue 6 Pages 1813-1814
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTetramethylammonium tetrabromocuprate [N(CH3)4]2CuBr4 crystal has been found to undergo successive phase transitions at −32°C and at −36°C on cooling, and to show ferroelectric activity along the pseudo-hexagonal cH axis in the intermediate phase.View full abstractDownload PDF (196K) -
Masaki Maeda, Takuro Ikeda1981 Volume 50 Issue 6 Pages 1815-1816
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElastic properties of ferroelectric K2Zn2(SO4)3 have been investigated by ultrasonic and piezoelectric resonance method. The stiffness c44E softens around the ferroelectric transition temperature, whereas c11 and c12 show only small abrupt jumps.View full abstractDownload PDF (272K) -
Kenji Shinozaki, Takuhei Nose1981 Volume 50 Issue 6 Pages 1817-1818
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy using the universal ratios among the critical amplitudes the relations among the exponents which characterize the molecular weight dependences of the critical amplitudes in polymer solutions are derived. The relations are easily deduced from the proposed scaling forms of the free energy density and the correlation function.View full abstractDownload PDF (240K) -
Kazuo Imasaki, Satoshi Higaki, Shunji Ido, Sadao Nakai, Chiyoe Yamanak ...1981 Volume 50 Issue 6 Pages 1819-1820
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe implosion efficiency of light ion beam (LIB) driven target were investigated by simulation. The results was explained by the simple cannon ball model during the early stage of the pulse when the thermal motion could be neglected.View full abstractDownload PDF (236K) -
Tomikazu Namikawa, Hiromitsu Hamabata, Kazuhiko Tanabe1981 Volume 50 Issue 6 Pages 1821-1822
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe first order CGL equations of electrons are applied to the propagation of whistler waves. It is shown that the electron thermal motion intensifies the tendency of whistler waves to follow the lines of force of the static magnetic field at appropriate values of electron temperature anisotropy.View full abstractDownload PDF (200K) -
Kenji Watanabe, Kazunori Ikegami, Atsuhiko Ozaki, Norio Satomi, Tadao ...1981 Volume 50 Issue 6 Pages 1823-1824
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCompact toroidal plasma has been experimentally obtained in a drum-type copper vessel on injecting an annular plasma stream from a magnetized plasma gun. Toroidal and poloidal magnetic fields, Bt and Bp, of the plasma toroid show a typical exponential decay with 110 μs and no MHD instability is observed. Experimental data of Bt and Bp configuration for long confinement are described fairly well by the model, which is the fundamental-mode state of the minimum energy force-free equilibrium estimated from the low-β limit Grad-Shafranov equation. The configuration of the stable plasma is hence fully-determined by the metal vessel geometry.View full abstractDownload PDF (280K) -
Fumio Ochiai, Ryuhei Sugahara, Yasuo Fukui, Mineo Fukawa, Hiromichi Ki ...1981 Volume 50 Issue 6 Pages 1825-1831
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInclusive production of ρ°(770), ω(783) and f(1270) has been studied in π−p interactions at 6 GeV/c. The inclusive cross sections for ρ° and f are; 2.9±0.3 mb and 0.47±0.07 mb. The semi-inclusive cross section for ω is 0.20±0.03 mb. These cross sections and ratios of ρ°/π, f/ρ° and K*+/ρ° are compared with higher energy data. The differential cross sections for ρ°, ω and f are presented as a function of Feynman scaling variable x and squared transverse momentum PT2. The x distributions for ρ° and ω show them to be produced primarily in the forward direction. Inclusive ρ°, ω and f resonance production in 6 GeV/c π−p interactions seems to have not yet reached the high energy limiting behavior.View full abstractDownload PDF (728K) -
Mitsuhiro Kawamura, Tsuyoshi Tomiyama, Hirokazu Kato1981 Volume 50 Issue 6 Pages 1832-1839
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe perturbed angular correlations of 333.0 keV–355.7 keV gamma-gamma cascade in 196Pt were measured on iron-gold alloy samples containing 0.2–0.5 at% gold impurity prepared by various thermal treatments. The shift of angular correlation pattern was obtained as ωτ=0.095±0.003 rad. The g-factor of the first excited level of 196Pt was determined to be g=0.346±0.013.View full abstractDownload PDF (1072K) -
Seiji Miyashita, Masuo Suzuki1981 Volume 50 Issue 6 Pages 1840-1845
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe study the ±J model in order to investigate the effect of frustration to the cooperative phenomena of spin glasses. We estimate the behavior of correlation functions using the percolation theory.View full abstractDownload PDF (660K) -
Motoko Asou, Fumiaki Shibata1981 Volume 50 Issue 6 Pages 1846-1853
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe problem of nonlinear transverse spin relaxation is treated rigorously; an analytic solution is obtained for J=1⁄2 and J=1 (J the magnitude of spin). For larger values of J, the basic equations are solved numerically. Poly-dispersive nature of the relaxation process is worked out in the linear-supreposition form of exponential decays with a number of characteristic relaxation times. This number is shown to be generally more than 2J, contrary to the longitudinal case.View full abstractDownload PDF (648K) -
Minoru Takahashi1981 Volume 50 Issue 6 Pages 1854-1860
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMean-field approximations such as molecular field approximation for spin system, Hartree-Fock approximation and BCS approximation for electron system are universally formulated by the Feynman inequality: −β−1 ln Tr exp (−βH)≤−β−1 ln Tr exp (−βH0)+Tr exp (−βH0)(H−H0)⁄Tr exp (−βH0). The method of generalization of mean-field approximation is given. This is applied to the problem of one-dimensional long-range Ising model.View full abstractDownload PDF (592K) -
Yutaka Toyozawa1981 Volume 50 Issue 6 Pages 1861-1867
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCharge transfer instability with structural change is studied with a simplest two-sites two-electrons model which allows exact treatment in the whole range of electron transfer energy T, on-site Coulomb energy U and the lattice stabilization energy S. The instability takes place when S overcomes T or U, the transition being of the second order for S-T competition and the first order for S-U competition, with a critical point inside the T-U-S triangle. The excited state is subject to instability with even smaller values of S. The effect of dimensionality on the nature of the transition is briefly discussed.View full abstractDownload PDF (816K) -
Bunjyu Shinozaki, Ryozo Aoki, Tomoyuki Miyazaki, Masahiro Katayama, Sh ...1981 Volume 50 Issue 6 Pages 1868-1872
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy shadow electron microscopy, the critical current density Jp has been measured in lead foils with a periodic one-dimensional thickness modulation. The superconducting and normal laminae in the intermediate state are produced to be parallel to the grooves on the specimen surface. The Jp in the modulated-surface specimen is larger than that in the flat-surface specimen. The enhancement of Jp as a function of temperature shows anomalies at some temperatures where abrupt changes of the laminar structure are observed. These anomalies are attributed to the discontinuous changes of the period of the laminar structure due to redistributions, but not to the increment of the number of the effective pinning centers due to the matching effect.View full abstractDownload PDF (636K) -
Hiroyuki Nagai, Yoshiaki Ikami, Hiroshi Yoshie, Akira Tsujimura1981 Volume 50 Issue 6 Pages 1873-1876
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe nuclear magnetic resonances of 55Mn nuclei have been observed in the intermetallic compounds RMn2 and (Y1−xGdx)6Mn23 where R is Gd, Tb, Ho and 0≤x≤1. The Mn moments in these compounds were estimated to be larger (0.8–1.3 μB/Mn) than those obtained from the magnetic measurements of R6Mn23 (0.4 μB/Mn). The hyperfine fields at 55Mn nuclei in RMn2 are expressed as the linear relation of (g−1)J. The Gd-contribution to the hyperfine fields at 55Mn nuclei in (Y1−xGdx)6Mn23 may be 13 kOe at most.View full abstractDownload PDF (488K) -
Takeshi Shinohara, Shinichi Kurosawa, Hideya Onodera1981 Volume 50 Issue 6 Pages 1877-1882
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic, X-ray and the Mössbauer effect measurements have been made on Mn1−xFexAlGe compounds for 0≤x≤0.10. All of the compounds were single phase and chemically ordered intermetallic compounds with Cu2Sb type structure. Over the whole concentration range, the Fe atoms were located at two different crystallographic sites and there was no magnetic moment either at site I and site II. The Mössbauer spectra did not show the Goldanskii-Karyagin effect in spite of having two dimensional exchange interaction in MnAlGe. The results are discussed in relation to the previous investigation.View full abstractDownload PDF (664K) -
Yoshiko Someya, Atsuko Ito, Setsu Morimoto1981 Volume 50 Issue 6 Pages 1883-1890
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Mössbauer spectroscopy is applied to the perovskite compound, RbFeF3, in the phase which is realized between T1 (39 K) and T2 (87 K). The Mössbauer spectra clearly indicate the existence of two kinds of Fe2+ sites. We label one of the sites as the site I and the other as the site II. From the Mössbauer spectra observed for a stress-free single crystal sample in an applied magnetic field, it is concluded that the spontaneous magnetization along a pseudo-cubic [100] axis originates in a ferrimagnetic spin arrangement; the magnetic moment of an Fe2+ ion at the site II is larger than that at the site I. It is also concluded that the spin easy axis coincides with a pseudo-cubic [100] axis along which the lattice constant is the smallest. From the Mössbauer parameters determined, the electronic state of an Fe2+ ion is inferred.View full abstractDownload PDF (1120K) -
Yoshiko Someya, Atsuko Ito1981 Volume 50 Issue 6 Pages 1891-1897
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Mössbauer spectroscopy is applied to the perovskite compound RbFeF3. It is concluded that in the phase realized below T1 (39 K) the spontaneous magnetization originates in a canting of the spins, i.e. the spins are almost along a pseudo-cubic [011] axis but cant by about 6° from the [011] axis, yielding spontaneous magnetization along a pseudo-cubic [0\bar11] axis. The temperature dependence of the Mössbauer parameters obtained for the three temperature regions below TN(101 K), T2(87 K)<T<TN, T1<T<T2, T<T1, is given.View full abstractDownload PDF (876K) -
Shigeru Tanaka, Koichi Mizushima, Shuichi Iida1981 Volume 50 Issue 6 Pages 1898-1902
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electron spin-lattice relaxation time T1 of isoelectronic Mn4+ and Cr3+ ions in rutile was measured from 1.7 K up to 35 K by the pulse saturation recovery method. It was found that, in the low temperature region, where relaxation was mainly due to the direct process, the relaxation rates of both Mn4+ and Cr3+ ions were in the same order of magnitude. On the other hand, above 15∼20 K where relaxation was mainly due to the Raman process, the relaxation rate of Mn4+ ion was found to increase more rapidly than that of Cr3+ ion.View full abstractDownload PDF (468K) -
Nobuyoshi Hosoito, Teruya Shinjo, Toshio Takada1981 Volume 50 Issue 6 Pages 1903-1908
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic properties of Fe surface overcoated with Pd were investigated by means of 57Fe Mössbauer spectroscopy. By UHV deposition, multilayer films were prepared, whose structures for instance were 56Fe(70 Å)–57Fe(3.5 Å)–Pd, or 56Fe(70 Å)–57Fe(3.5 Å)–56Fe(3.5 Å)–Pd. The hyperfine field at 4.2 K of the first surface layer was smaller than the bulk value. The spin direction was confirmed to be ferromagnetic. At 300 K, the first surface layer behaved paramagnetically and the exchange field was considered to be remarkably weak. On the other hand, the hyperfine fields of the next few layers were slightly larger than the normal value. A Friedel type oscillation of the surface magnetization was thus suggested.View full abstractDownload PDF (704K) -
Kinshiro Hirakawa, Koji Ubukoshi1981 Volume 50 Issue 6 Pages 1909-1916
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLinear and nonlinear responses of magnetization in K2CuF4 (Tc=6.25 K) have been measured as functions of magnetic field and temperature for both directions parallel and normal to the easy plane. The measured isothermal magnetizations for the direction parallel to the plane strongly suggest that the transition point in K2CuF4 is fundamentally of the Kosterlitz-Thouless type but modified slightly by the 3D interactions. When the field is applied normal to the plane, a critical line indicating the lowering of the Tc is observed. This again suggests the transition is of characteristic for the XY-system.View full abstractDownload PDF (1000K) -
Kazuyoshi Takeda, Yuichi Okuda, Isao Yamada, Taiichiro Haseda1981 Volume 50 Issue 6 Pages 1917-1924
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe static spin correlations in a diluted two-dimensional Heisenberg ferromagnet K2CuxZn(1−x)F4 have been studied. At low temperatures T<3.5 K, the magnetic heat capacity Cm(T) per mole for Cu2+ ions in the pure system (x=1.0) has been revealed to obey the spin wave theory for a two-dimensional Heisenberg ferromagnet with the nearest neighbour exchange constant J⁄kB=11.4±0.4 K. Near the percolation limit (xp=0.59), the absolute value of Cm(T) in the same temperature range has been found to agree with the exact solution for the one-dimensional Heisenberg ferromagnet with the same interaction term as in the pure system. The quantities of Cm(T) for x=0.36 and x=0.26 are discussed in comparison with the theoretical results for the finite size of open chains and closed rings, by taking account of the possible shape of the magnetic clusters presented by the computer generated random system in two dimensions.View full abstractDownload PDF (984K) -
Yoshiro Kakehashi1981 Volume 50 Issue 6 Pages 1925-1933
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Liberman-Pettifor virial theorem is extended to the finite temperatures, and the expressions for the spontaneous volume magnetostriction and the electronic contribution to the thermal expansion coefficient are given by using the functional integral method within the static approximation. The temperature variations of these quantities are determined mainly by the amplitude of the local magnetic moment and the s-d charge transfer. Two types of the thermal expansion, the αFe type and the Weiss model type, appear within the CPA–LSA and their properties are examined and discussed.View full abstractDownload PDF (1004K) -
Satoru Ohno1981 Volume 50 Issue 6 Pages 1934-1941
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic susceptibilities of 3d-transition metal solutes in liquid Se–Te alloys have been measured in order to study the s-d interaction between the localized d-states and the conduction electrons. The additional susceptibilities of transition metal solutes except V increase monotonically with increasing Se concentration.
However, that of V changes with minimum at 40 at% Se. The nonmagnetic states of V, Co and Ni solutes have been discussed with Anderson model. According to this analysis, the changing trend of additional susceptibilities as a function of Se concentration is explained from the decreasing effect of Nd and the increasing effect of (U+4J)⁄Δ.View full abstractDownload PDF (816K) -
Hiroshi K. Yoshida, Kiyoyuki Terakura, Junjiro Kanamori1981 Volume 50 Issue 6 Pages 1942-1950
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAb initio calculations of the hyperfine field Hhf and the nuclear spin-lattice relaxation time T1 are carried out for substitutional impurity nuclei of a non-transition element in a ferromagnetic iron. The systematic variations of Hhf and T1 observed experimentally are semiquantitatively reproduced by the present calculation. Similar investigation was previously done for the case of nickel host. The difference and similarity between the two cases are discussed. An analysis on the contribution to Hhf from bound states is also given.View full abstractDownload PDF (1012K) -
Fujio Kakinuma, Satoru Ohno1981 Volume 50 Issue 6 Pages 1951-1957
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electrical resistivities and the magnetic susceptibilities of liquid tellurium alloys containing the rare earth solutes have been measured from the melting point to about 900°C. The temperature-independent susceptibilities of light rare earth solutes are considerably larger than the theoretical values. The effective magneton numbers of light rare earth solutes are smaller than the theoretical values. The 4f electrons of light rare earth solutes interact with the conduction electrons. The additional resistivities do not vary much from one rare earth to another. The increments of the resistivity caused by the rare earth solutes are interpreted as a decrease in the density of states at Fermi level EF.View full abstractDownload PDF (748K) -
Yoshikazu Ishikawa, Kazuyoshi Yamada, Keisuke Tajima, Kazuaki Fukamich ...1981 Volume 50 Issue 6 Pages 1958-1963
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spin waves in an amorphous Invar alloy Fe86B1411, have been studied by inelastic neutron scattering. Well defined magnon groups were detected around (0, 0, 0) up to q=0.12 Å−1 for various temperatures below T≤0.9 Tc. The spin waves show the dispersions hωq(T)=E0(T)+D(T)q2 with D(T) varying with temperature according to D(T)=D(0)(1−aT5⁄2) with D(0)=118±6 (meVA2). The spin wave stiffness at 0 K, D(0), thus determined is almost twice as large as the value DM(0)=68±2 (meVA2) determined for the same sample by a magnetization measurement. The spin wave linewidth Γ varies with wave vector q as Γ=aq2 and it shows only limited temperature dependence. All of these features are quite similar to those found in the crystalline Invar alloys as Fe65Ni35 and Fe3Pt.View full abstractDownload PDF (636K) -
Yoji Koike, Sei-ichi Tanuma1981 Volume 50 Issue 6 Pages 1964-1969
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSuperconducting properties of C8KHg have been investigated by AC magnetic susceptibility measurements. The measured values of Tc are 1.90 K and 1.70 K for two samples. From the measurements under DC magnetic field, the superconductivity is found to be the type II in all the field directions. Hc2 is markedly anisotropic, but the angular dependence of Hc2 is fairly well understood by means of the 3D anisotropic effective mass model. The characteristic parameter γ is too large, e.g. 64 or 76, to apply the 2D Josephson-coupling model. So, C8KHg is regarded as a 3D superconductor with a very large anisotropy rather than a 2D one. As the obtained effective mass ratio is as large as 940 or 920, the electronic band structure of C8KHg seems more anisotropic than that of C8K. In C4KHg, superconductivity has not been found above 1.5 K.View full abstractDownload PDF (664K) -
Naoki Kishimoto, Kazuo Morigaki, Kouichi Murakami1981 Volume 50 Issue 6 Pages 1970-1977
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSConductivity-enhancement effect induced by electron spin resonance was investigated in amorphous Si1−xAux films prepared by electron-beam evaporation. Conductivity, conventional ESR and conductivity-change at ESR were measured from 77 K to 300 K for various Au concentrations. The ESR signal was detected in Au concentration region of x\lesssim10%. The linewidth of ESR showed temperature variation and the spin density was reduced by doping of Au atoms. The conductivity-increase was detected at Au concentrations of x\lesssim1.4% and showed characteristic variations with temperature and Au concentration. These results are discussed in terms of variable-range hopping conduction.View full abstractDownload PDF (1068K) -
Toshimichi Ito, Motohiro Iwami, Akio Hiraki1981 Volume 50 Issue 6 Pages 1978-1985
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLow energy electron loss spectroscopy (ELS) study was performed on 1T-HfSe2 (group IVB metal compound) and 2H-NbSe2 (group VB metal compound) by using incident electron energies of 30–250 eV. From the loss data in the second derivative form, maxima in density-of-states in the conduction band of the compounds were deduced through the information on the filled core states by X-ray photoelectron spectroscopy. The conduction band of the transition-metal dichalcogenides could be devided into two parts. The results are discussed in relation to the previous work on WS2 (group VIB metal compound), and also to proposals based on band calculations and experimental studies on the transition-metal dichalcogenides with constituent metals of group IVB, VB and VIB.View full abstractDownload PDF (1092K) -
Tatsuro Miyasato, Masao Tokumura, Minoru Toguchi, Fumio Akao1981 Volume 50 Issue 6 Pages 1986-1991
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSHeat-pulse propagation along the [100] axis of As (1.5×1014/cm3 and 0.9×1015/cm3)-doped Ge has been studied as a function of the magnetic field H⁄⁄[100] and of the heat-pulse temperatures ranging from 6.6 K to 9.3 K. It is shown that the transmitting heat-pulse intensity detected by CdS bolometer increases with increasing magnetic field up to 60 kG at sample temperatures ranging from 1.8 K to 4.2 K. The magnetic field dependence of the detected heat-pulse amplitude is compared with a calculation based on the Suzuki-Mikoshiba theory.View full abstractDownload PDF (688K) -
Kazushige Kawabata, Masayuki Ido, Takashi Sambongi1981 Volume 50 Issue 6 Pages 1992-1997
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Hall effect in NbSe3 was measured in the non-Ohmic regimes below the charge-density-wave (CDW) transitions at 142 K and 58 K. In both regimes, relation between the Hall voltage and the current becomes nonlinear above the threshold electric-field ET while linear relation remains between the Hall voltage and the electric field. Both nonlinearities of the conductivity and the Hall voltage are consistently explained by taking into consideration a new current-carrying mechanism which contributes only to the conductivity along the b-axis above ET. The new mechanism is attributed to the sliding CDW. In NbSe3, the CDW’s are expected to slide only along the b-axis as inferred from the Ohmic transverse conductivity along the c-axis.View full abstractDownload PDF (664K) -
Yasutami Takada1981 Volume 50 Issue 6 Pages 1998-2005
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBased on the calculated results of the subband structure given in the first paper of the present series, the resonance energies of the inter-subband optical absorption in n-channel inversion layers on the surface of InSb are obtained by the calculation of the dynamic conductivity in both the parallel and the perpendicular directions to the surface. Because of the nonparabolicity, the resonance peaks of the inter-subband transitions are seen even in the conductivity parallel to the surface. These peaks give the energy separations between the subbands directly, because the depolarization shift appears only in the conductivity perpendicular to the surface. The calculated results of the resonance energies are compared with the experimental ones measured by Koch’s group.View full abstractDownload PDF (924K) -
Hirokazu Tanaka, Itaru Tatsuzaki1981 Volume 50 Issue 6 Pages 2006-2013
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe VV scattering spectra in the ab plane were measured with various scattering angles. It is shown that the elastic stiffness constant C66 shows clear dispersion near the transition temperature Ttr just in the frequency region of GHz. A dynamic central peak (DCP) was observed in the spectra of quasitransverse acoustic phonon near q⁄⁄[100] in the very vicinity of Ttr. From the observed angular dependence of the linewidth of DCP it is revealed that this central peak scattering is caused by the piezoelectric interaction between the z-component of the polarization fluctuation and the xy shear component in the quasitransverse phonon.View full abstractDownload PDF (1100K) -
Taisei Yamamoto, Gen Soda, Nobuo Nakamura, Hideaki Chihara1981 Volume 50 Issue 6 Pages 2014-2021
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSProton resonance line shape and spin-lattice relaxation time T1 were measured for polycrystalline NH4H(CH2ClCOO)2 in ferro- and para-electric phases. Peculiar line shape and its temperature variation were ascribed to increasing tunnel splitting between the A and T symmetry levels in the librational ground state of NH4+ ion from 15 kHz at 23 K to 20 kHz at 60 K. This increase corresponds to a decrease of rotational potential barrier (14.6 kJ mol−1 at 0 K) and a decrease of the ferroelectric order. Deuteron resonance line shape and T1 were also measured for polycrystalline ND4D(CH2ClCOO)2. An extra line-width below Tc was proportional to (Tc−T)0.76±0.09. An activation energy of NH4+ and ND4+ reorientation above the transition point, 10.9 kJ mol−1, was deduced from the T1 data.View full abstractDownload PDF (916K) -
Yoshinori Takeuchi, Haruyasu Yamashita, Itaru Tatsuzaki1981 Volume 50 Issue 6 Pages 2022-2028
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of ultrasonic velocities of TGSe single crystal was studied at several hydrostatic pressures. Particularly, the sound velocities near tricritical point (Ttri=40.6°C, ptri=5 kbar) were measured minutely. At atmospheric pressure, there is a difference between the transition temperature and the temperature at which the anomalous part of the sound velocity takes maximum. On approaching tricritical point, this temperature difference becomes small and disappears ultimately in the first order phase transition region. The pressure dependence of the magnitude of anomalous part of the sound velocity along the a* axis is examined. It is found that these pressure dependences are due to tricritical nature if the polarization relaxation is taken into account.View full abstractDownload PDF (756K) -
Kazuyuki Itoh, Naoyuki Mishima, Eiji Nakamura1981 Volume 50 Issue 6 Pages 2029-2036
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe absolute structure of Ca2Sr(C2H5CO2)6 at room temperature was determined by using X-ray reflection data collected by a four-circle automatic diffractometer with the R-factor of 0.027. The space group of levorotatory crystals is D44-P41212 and that of dextrorotatory ones D48-P43212. A difference Fourier synthesis revealed that electron densities of the methyl groups exhibited doubly peaked or largely elongated contours. The split-atom calculation has established that four of the methyl groups together with one of the α-carbons in a formula unit are in disordered state occupying respectively two equilibrium atomic positions with the same probability.View full abstractDownload PDF (932K) -
Wataru Kinase, Minoru Tanaka, Toshio Miyazawa1981 Volume 50 Issue 6 Pages 2037-2042
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe birefringences of NaNO2 and NaNO3 have been discussed by taking account of the dipole interaction among the Na-ions and the NO2-radicals or NO3-radicals. From the condition necessary to explain the birefringence the electronic polarizabilities of these radicals are obtained. The radicals have generally the anisotropic polarizabilities. It seems valid to attribute this property to the anisotropy of the N–O bond. Among the various models, it can be concluded that the model based upon the bonds is more suitable than that of the dipole model within the region of the radicals. Discussion about the birefringence by comparing with that of CaCO3 is also made.View full abstractDownload PDF (772K) -
Naoki Mizoguchi, Hidemitsu Hayashi, Michisuke Kobayashi, Isaaki Yokota1981 Volume 50 Issue 6 Pages 2043-2049
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe frequency and wave number dependent transverse conductivity of α-AgI type superionic conductors is calculated by using a continuum model. The anion cage is supposed to be immersed in the cation liquid. A short-range viscoelastic force as well as the Coulomb interaction is taken into account as the anion-cation interaction. The calculated conductivity, which satisfies the sum rule, reproduces the main features of the experimental results. The spectral density function and the dispersion relation of polaritons are also computed. It is shown that the latter is much similar to that in ordinary ionic crystals except that phonons are much damped.View full abstractDownload PDF (580K) -
Shin-ya Miyatani, Akira Tabuchi1981 Volume 50 Issue 6 Pages 2050-2053
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAmbipolar mobility and diffusion coefficient in the ion-electron mixed conductor α Ag2S are measured by means of the arrangement similar to the well-known Haynes-Shockley’s injection experiemnt on Ge. Two sets of Ag/AgI and Pt electrodes facing each other are used as emitter and collector. The values obtained are in good accordance with the theory.View full abstractDownload PDF (420K) -
Mamoru Tanibayashi, Masanori Tsuda1981 Volume 50 Issue 6 Pages 2054-2062
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe response of the system of the charged edge dislocations and the surrounding charge clouds in ionic crystals to the applied electric field is calculated in the linear approximation. It is assumed that there is only one type of movable charged point defects, and the motion of them are described by a hydro-dynamic equation. As for the motion of the dislocations, the string model is adopted and only electric interaction between the dislocation and point defects is considered. From this model, the displacement of the dislocation caused by the applied electric field, the effective field that the dislocation senses and the polarization of the system are obtained. The calculation can explain the value of piezo-electric modulus due to charged dislocations obtained experimentally. It is also shown that Q-value and compliance defect can be explained by the calculation for the stress field case.View full abstractDownload PDF (979K) -
Tetsuji Gotoh, Shunichi Murakami, Koreo Kinosita, Yoshitada Murata1981 Volume 50 Issue 6 Pages 2063-2068
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSVacuum-cleaved MgO(001) surface has been studied by reflection high energy electron diffraction (RHEED). With specimens heated to 300°C and gradually cooled anomalous enhancement of Kikuchi pattern is observed in the [100] azimuth at glancing angle 3.5°, which is unobservable with as-cleaved specimens. The appearance of such pattern is attributed to differential relaxation of surface anions and cations, or surface rumpling, that has occurred during the annealing. From the values of glancing angle given above, the magnitude of rumpling is estimated at 6% of the normal atomic spacing.View full abstractDownload PDF (740K) -
Katsuaki Sato, Teruo Teranishi1981 Volume 50 Issue 6 Pages 2069-2072
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSReflectivity spectra of a single crystal of a metallic ferromagnet CoS2 were measured between 0.5 and 5.0 eV at room temperature in air. Photon energy dependencies of optical constants n and k, an absorption coefficient α and real and imaginary parts of dielectric constant ε (=ε′+iε″) have been obtained from the Kramers-Kronig analysis of the reflectivity data. Absorption spectrum of a thin polycrystalline film was also measured, which proved to be in quantitative agreement with the one deduced from the reflectivity spectrum. From the curve of ε′ the free electron plasma frequency ωp was located at 0.8 eV from which number of free electrons was evaluated to be 0.5 per a CoS2 molecule.View full abstractDownload PDF (432K) -
Shigeo Kinno, Ryumyo Onaka1981 Volume 50 Issue 6 Pages 2073-2077
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe optical properties of MgBr2 have been studied by means of the reflection spectra in the region from VUV to XUV, the absorption spectra in the VUV region, and also by the XPS and UPS. Besides, the band structure of the valence bands is calculated by the tight binding method and the lower conduction bands by use of the empty lattice model.
It is found that the top of the valence bands consists of Γ3− and Γ2− bands which are almost degenerate by the crystal field, and that the observed four exciton peaks are tentatively explained as the spin-orbit splitting of these two levels.View full abstractDownload PDF (512K) -
Kenichi Tomioka, Motoaki Iemura, Atsuo Matsui1981 Volume 50 Issue 6 Pages 2078-2083
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSReflectance spectra of pyrene have been measured on the ab plane of single crystals at 300 and 77 K. Refractive indices, complex dielectric constants and absorption coefficients are calculated for the a- and b-polarized components by Kramers-Kronig analysis of the reflectance spectra. Brief discussions on the Davydov splitting, vibrational levels, polarization ratios and the spectral change due to the phase transition are given.View full abstractDownload PDF (708K) -
Yasuharu Kashihara, Hide Yoshioka1981 Volume 50 Issue 6 Pages 2084-2090
Published: June 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTaS2 intercalated with pyridine was investigated by electron diffraction. The single-phase crystals showed streaks and diffuse spots. Besides this pattern mixed-phase crystals showed two types of superlattice patterns with rectangular cells 9a×2\sqrt3a and 13a×2\sqrt3a.View full abstractDownload PDF (1148K) -
Yasuhiro Shinnaka, Seishi Yamamoto1981 Volume 50 Issue 6 Pages 2091-2094
Published: June 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSX-ray diffuse scattering due to the orientational disorder of NO3− ions is observed in cubic RbNO3 of the CsCl type (phase III) with photographic and counter methods. The observed diffuse scattering is essentially identical to that observed previously in cubic NH4NO3 by the present authors. The temperature dependence of its intensity suggests that the orientational disorder of NO3− ions does not show an anomaly associated with the dielectric anomaly in the vicinity of the transition to the higher temperature phase II, but shows the pre-transformation effect towards the lower temperature phase IV.View full abstractDownload PDF (540K)